👷 ci: add Docker image workflow

.github/workflows/docker.yml

@@ -0,0 +1,92 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - "**"
+    tags:
+      - "v*.*.*"
+      - "*.*.*"
+  pull_request:
+
+permissions:
+  contents: read
+  packages: write
+
+concurrency:
+  group: docker-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  IMAGE_NAME: ghcr.io/${{ github.repository_owner }}/cloudflare-ddns-updater
+
+jobs:
+  checks:
+    name: ${{ matrix.check }}
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        check:
+          - typecheck
+          - format
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Set up Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: 1.3.14
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Run ${{ matrix.check }}
+        run: bun run ${{ matrix.check }}
+
+  build:
+    name: Build Docker Image
+    runs-on: ubuntu-latest
+    needs: checks
+    if: >-
+      github.event_name == 'pull_request' ||
+      github.ref == format('refs/heads/{0}', github.event.repository.default_branch) ||
+      startsWith(github.ref, 'refs/tags/')
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v4
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v6
+        with:
+          images: ${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{raw}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v7
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

package.json

@@ -20,8 +20,8 @@
   },
   "scripts": {
     "typecheck": "tsc --noEmit",
-    "format": "prettier --write .",
+    "format": "prettier --check .",
-    "format:check": "prettier --check .",
+    "format:fix": "prettier --write .",
     "dev": "bun --watch src/index.ts",
     "start": "bun src/index.ts",
     "build": "bun run typecheck",